广西珊瑚钨锡矿田成矿地球化学机理及成矿模式

珊瑚钨锡矿田产出有钨锡石英脉、钨锑萤石石英脉和含钨石英角砾脉3种类型。以长营岭隐伏花岗岩为中心,自东往西、自深部到浅部形成单侧水平分带和垂向分带,它们属同一成矿系列。成矿时,成矿流体由富含W,Sn等成矿元素及F,B等运矿元素的高中温、酸性、高fs_2、低fo_2、类硫酸盐型的岩浆水,逐渐转化为有地下水掺和的富含Cl、中低温、弱酸-中性、高fo_2、低fs_2、类氯化物型的混合流体。成矿物质由岩浆提供逐渐转化为主要由地层提供。该成矿系列的形成是成矿流体不断演化的结果,属多源多因复成矿床。

THE MINEROGENETIC MECHANISM AND GEOCHEMICAL MODEL OF SHANHU W-Sn ORE FIELD,GUANGXI

There are three types of ore deposits in Shanhu W-Sn ore field. They are the wolframitecassiterite-quartz vein, the wolframite-stibnite-fluorite-quartz vein and the ferberite- quartz breccia vein types. Taking Changyingling hidden granite as a centre they form unilateral-horizontal zoning from the east to the west and vertical zoning from the depth to the upper part. They are considered as the same minerogenetic series. During early mintralizatim period, the ore-forming fluid is characterized by similar sulfate- type magmatic water which is rich in W, Sn, F, B ect. and hypo- mesothermal, acid, higher fs_2and lower fo_2. By the later period, the ore-forming fluid gradually transforms into a similar chloride-type mixed-fluid which is contaminated with groundwater, is rich in Cl and meso-epithermal, weak acidneutral, higher fo_2 and lower fs_2. Supply of the ore-forming materials is provided from magmatic to stratigraphic source. The formations, of the minerogenetic series may be considered to be a result of evolution for the ore-forming fluid, and their ore-forming materials come from many-sided sources. Three types of ore deposits in the minerogenetic series are regarded as polygenetic compound ore deposits.